Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
  • A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
  • A61L2/08—Radiation
  • A61L2/10—Ultraviolet radiation
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
  • A61L2/26—Accessories or devices or components used for biocidal treatment

Definitions

• the invention relates to a device for decontaminating a turbid liquid, in particular a liquid food.
• the decontamination devices of a liquid perform a decontamination using ultraviolet rays.
• such decontamination devices comprise a sheath having at least one outer wall so as to define a flow space of the liquid to be decontaminated.
• a series of ultraviolet sources is arranged so as to irradiate, through the outer wall of the sheath, the liquid to be decontaminated.
• ultraviolet rays penetrate with difficulty in turbid liquids. Therefore, to ensure good decontamination of the turbid liquid, it is necessary to have a flow of said liquid which is turbulent. This implies, in the case of the devices described in the prior art, high movement speeds and therefore significant pressures involving consequent industrial installations.
• An object of the invention is to provide a device for decontaminating a liquid which allows an optimal decontamination of turbid liquid without requiring high movement speeds to obtain a turbulent flow required.
• a device for decontaminating a turbid liquid, especially of the food type comprising a sheath extending longitudinally along an axis X, having an outer wall and a inner wall substantially coaxial with each other and defining an annular space for circulation of the liquid to be decontaminated, a series of ultraviolet ray sources positioned externally around the sheath, the inner wall having a surface opposite the annular circulation space having a profile along the X axis accident.
• the decontamination device according to the invention has at least one of the following technical characteristics:
• the inner wall delimits a central cylindrical space for circulating a heat transfer fluid
• the facing surface of the annular circulation space is cylindrical and has a profile along a generatrix of the cylindrical surface comprising a succession of concave and convex forms alternately;
• the profile comprises at least one section of sinusoidal shape
• the profile comprises arcs of circles
• the profile comprises at least one section comprising a succession of alternately concave and convex portions of the circle;
• the profile comprises at least one section of waveform
• the cylindrical surface is at least partly of annular shape
• the outer wall comprises a surface facing the annular circulation space having a profile along the X axis that is hilly;
• the device comprises a series of reflectors associated with the series of ultraviolet ray sources, the series of reflectors being arranged so as to reflect at least a portion of the ultraviolet rays towards the sheath;
• the inner wall is made of stainless steel;
• the outer wall is made of a material leaving ultraviolet rays, especially quartz;
• ultraviolet ray sources are light-emitting diodes.
• the sources of ultraviolet rays are sources of pulsed light.
• FIG. 1 is a sectional view along 1-l of a device for decontaminating a turbid liquid according to the invention
• FIG. 2 is a side view of the device of FIG. 1;
• FIG. 3 is a sectional side view along line III-III of the device of FIG. 1;
• FIG. 4 is a side view of the inner wall of the sheath of the device of Figure 1;
• FIG. 5 is a detail view V of the inner wall of Figure 4.
• FIGS. 6 and 7 are detailed views of alternative embodiments of the internal wall of FIG. 4.
• the device for decontaminating a turbid liquid 1 according to the invention is of elongate shape and extends longitudinally about a longitudinal axis X.
• the device for decontaminating a turbid liquid 1 according to the invention comprises a casing 10.
• the device for decontaminating a turbid liquid 1 according to the invention comprises an elongated sheath 7 which is positioned centrally coaxially to the longitudinal axis X.
• the sheath 7 comprises, centripetally, an outer wall 2, a circulation space 4, an inner wall 3 and a central space 5.
• the sheath 7 is of generally cylindrical shape with a longitudinal axis X , in particular of cylindrical general shape of revolution.
• the device for decontaminating a turbid liquid 1 further comprises a series of sources 6 of ultra-violet rays positioned in the casing 10, externally around the sheath 7.
• the sources 6 ultraviolet rays The violets are positioned at a distance from the sheath 7 along a circumferential periphery of axis, the longitudinal axis X.
• the sources 6 of ultraviolet rays are uniformly distributed along said circumferential periphery.
• the sources 6 of ultraviolet rays are eight in number. Other quantities are possible.
• the sources 6 of ultraviolet rays are known mercury lamps per se, or light emitting diodes.
• the ultraviolet ray sources are sources of pulsed light.
• pulsed light is that in addition to the ultraviolet rays emitted, other types of light rays are emitted, such as infra-red rays or in the visible, which have additional germicidal effects on the turbid liquid to be treated.
• the casing 10 comprises, at each of its ends along the longitudinal axis X, closing flanges 11 and 12 in which access and connection means 61 to the sources 6 of ultraviolet rays are provided and arranged .
• access and connection means 61 to the sources 6 of ultraviolet rays are provided and arranged .
• the device for decontaminating a turbid liquid 1 comprises a reflection means 20 which is arranged so as to reflect part of the ultraviolet rays emitted by the ultra-violet sources 6. -violets to the sheath 7.
• the reflection means 20 comprises a set of reflectors 21, each of the reflectors 21 being associated with a source 6 of ultraviolet rays of the series of sources 6 of ultraviolet rays.
• Each of the reflectors 21 is here an ellipse portion partially surrounding the source 6 of ultraviolet rays associated therewith.
• each of the reflectors 21 within the device for decontaminating a turbid liquid 1 according to the invention is such that the associated source 6 of ultraviolet rays is positioned at a first focal point of the portion d ellipse, while the sheath 7 forms the second focal point of the ellipse portion.
• the amount of ultraviolet rays emitted by the source 6 of ultraviolet rays that is not returned to the sheath 7 is included in two sectors of angles ⁇ on either side of a sector of direct illumination b of the sheath 7 by the source 6 of ultraviolet rays.
• the angle a is of the order of 50 °.
• the ellipse portion forming the reflector 21 is chosen so as to minimize the value of the angle a.
• the inner wall 3 extends opposite and at a distance from the outer wall 2.
• the two inner and outer walls 3 and 3 are coaxial with respect to each other.
• the two outer and inner walls 2 and 3 delimit, between them, the circulation space 4 which is annular in shape and wherein is intended to circulate the liquid to be decontaminated.
• the inner wall 3 delimits the central space 5 cylindrical, radially internal, in which is intended to circulate a heat transfer fluid.
• the central space 5 is coaxial with and surrounded by the annular circulation space 4 of the liquid to be decontaminated.
• the use of a heat transfer fluid circulating in the central cylindrical space makes it possible to maintain the liquid under a predetermined threshold temperature.
• the outer wall 2 is made of a material that allows ultraviolet rays to pass, for example quartz.
• the ultraviolet rays emitted by the sources 6 can diffuse into the annular circulation space 4 and thus irradiate the liquid to be decontaminated which circulates there.
• the annular circulation space 4 of the liquid to be decontaminated is fluidly connected respectively to an inlet 41 of the liquid to be decontaminated and to an outlet 42 of the liquid. decontaminated.
• the inlet 41 and outlet 42 are oriented radially and centrifugally at the ends of the sheath 7.
• the central space 5 cylindrical is fluidly connected respectively to an inlet 51 of coolant and an outlet 52 of heat transfer fluid.
• the inlet 51 and outlet 52 of heat transfer fluid are oriented in the axis of the central space 5.
• the inner wall 3 is of generally cylindrical shape, here of cylindrical shape of revolution along the longitudinal axis X.
• the inner wall 3 is made of a stainless material for example, such as stainless steel food grade 316L.
• the inner wall 3 comprises a cylindrical surface 37 which extends facing the annular circulation space 4 of the liquid to be decontaminated, on the one hand, and, on the other hand, opposite and at a distance from the outer wall 2
• the cylindrical surface 37 has a profile along a generatrix of said cylindrical surface 37 which is uneven.
• the profile along a generatrix of the cylindrical surface 37 comprises a succession of concave and convex shapes 36 alternately. It should be noted that the concavity and convexity of the shapes is established with respect to the annular circulation space 4. Illustrated in FIG. 5 in particular, the profile along a generatrix of the cylindrical surface 37 has forms concaves 35 which are arcs of circles and convex shapes 36 which are also arcs of circles. This forms a succession of alternately concave arcs 35 and convexes 36. In an alternative embodiment, the arcs of the circle are replaced by arcs of ellipse.
• the profile along a generatrix of the cylindrical surface 437 has concave shapes 435 which are arcs of circles and convex shapes 436 which are protruding points in the annular circulation space 4, each of the projecting points being obtained by the junction of two circular arcs forming concave shapes 435 adjacent.
• the cylindrical surface 437 has a ring shape.
• the arcs of the circle are replaced by arcs of ellipse.
• the profile along a generatrix of the cylindrical surface 337 comprises a succession of waves comprising hollow forming concave shapes 335 and vertices forming Convex forms 336.
• a depression 335 and an apex 336 are connected by a long slope 333 and a short slope 334.
• the succession of waves forms a sinusoid along the profile along the vertical axis. a generatrix of the cylindrical surface 337.
• the inner wall 3 is formed integrally.
• the inner wall 3 is formed of several sections 31, 32 which are abutted to one another by a weld 33 or any other suitable assembly technique known per se.
• the inner wall 3 comprises two end sections 31 symmetrical relative to each other separated by and abutting to a central section 32.
• the outer wall 2 has a surface facing the annular circulation space 4 having a profile along the X axis accident.
• this surface being cylindrical
• the profile along a generatrix of said surface can be according to one of the previously presented profiles relating to the inner wall 3.
• the shape of the profile along a generatrix of the cylindrical surface 37, 337, 437 is chosen according to the turbid liquid which will be decontaminated by the device for decontaminating a turbid liquid 1 according to the invention.
• the turbidity and viscosity parameters of the liquid to be decontaminated allow the person skilled in the art to choose the shape of the appropriate profile so as to optimize the decontamination of the turbid liquid without necessitating high movement speeds in order to obtain the turbulent flow required. in the annular circulation space 4 of the device for decontaminating a turbid liquid 1 according to the invention.
• the shape of the appropriate profile so as to optimize the decontamination of the turbid liquid without necessitating high movement speeds in order to obtain the turbulent flow required.

Landscapes

• Health & Medical Sciences (AREA)
• Epidemiology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Physical Water Treatments (AREA)
• Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
• Apparatus For Disinfection Or Sterilisation (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=62062923

Family Applications (1)

Country Status (2)

Citations (6)

• 2018
  • 2018-04-24 EP EP18169016.5A patent/EP3560520A1/de not_active Withdrawn
• 2019
  • 2019-04-23 WO PCT/EP2019/060372 patent/WO2019206912A1/fr active Application Filing

Patent Citations (6)

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